-most magma is emplaced at depth.
-structures that result from the emplacement of igneous material are called plutons
-intrusive igneous bodies are generally classified as tabular or massive+ by their orientation with respect to the host rock
-plutons are discordant(disagree) if they cut through existing structures
-plutons are concordant(agree) when they form parallel to features like sedimentary strata
-dikes-tabular discordant bodies that are produced when magma is injected into fractures
-most dikes are a few meters thick
-dikes are found in groups that served as vertically oriented pathways followed by molten rock that had lava flows
-dikes weather more slowly than surrounding rock
-sills-tabular plutons formed when magma is injected along sedimentary bedding surfaces
-sills form only at shallow depths,intruded between layers
-one of the largest sills is the Palisades Sill
-columnar joints form when igneous rocks cool & develop shrinkage fractures that produce elongated pillarlike columns
-laccoliths form when magma is intruded between sedimentary layers in a near-surface environment
-batholiths-largest intrusive igneous bodies, occur as linear structures
-evidence that supports that magma can move through solid rock are called inclusions called- xenoliths
-magma originates in the upper mantle
-mantle is solid, not molten rock
-structures that result from the emplacement of igneous material are called plutons
-intrusive igneous bodies are generally classified as tabular or massive+ by their orientation with respect to the host rock
-plutons are discordant(disagree) if they cut through existing structures
-plutons are concordant(agree) when they form parallel to features like sedimentary strata
-dikes-tabular discordant bodies that are produced when magma is injected into fractures
-most dikes are a few meters thick
-dikes are found in groups that served as vertically oriented pathways followed by molten rock that had lava flows
-dikes weather more slowly than surrounding rock
-sills-tabular plutons formed when magma is injected along sedimentary bedding surfaces
-sills form only at shallow depths,intruded between layers
-one of the largest sills is the Palisades Sill
-columnar joints form when igneous rocks cool & develop shrinkage fractures that produce elongated pillarlike columns
-laccoliths form when magma is intruded between sedimentary layers in a near-surface environment
-batholiths-largest intrusive igneous bodies, occur as linear structures
-evidence that supports that magma can move through solid rock are called inclusions called- xenoliths
-magma originates in the upper mantle
-mantle is solid, not molten rock